(1) I wasn't sure how to translate "sur le passé présent", I thought perhaps it could be talking about a recent past, like something that just happened

(2) "Un mot" is like, a brief mention of something, a word about something, and "de l'encre qui rature" (ink that crosses out/erases). The two things separate didn't make sense so I thought maybe it was talking about the two people in the song talking about old wounds with each other, like sharing bad memories that they had gotten over

(3) I wasn't sure how to translate "suivre" in this case, because "to follow" didn't seem right (who would want to follow a bad memory)? And I sense that it means something else, but I couldn't find any meaning that made sense. If anyone has a better suggestion, feel free to tell me.